Would I have to do a separate plugin for each time I wanted to do that or could I just keep adding links like this to it? That might actually work out better as a plugin.

This Hack is designed to handle simple Things like page1.php - Viewing Page 1 etc.

For more complicated stuff, as said, you have to make your own Plugins :)

The question I asked above was about plug-ins. I understand what you mean about the hack. I'm asking if I can add more links like this to a plg-in or would I have to do a separate plug-in for each link? ;)

You can do it in 1 Plugin and i'd recommend to make only 1 Plugin.

One plug-in for multiple links or one plug-in for this one link? I just want to make sure I get it right is all.

1 Plugin

Working like a charm. I would say the README needs to state where to find the options (which are under Maintenance).

Added that to the readme :)

Kirby, is there any way to make this recognize urls in a subfolder within the forums? For example, I have PhotoPost installed and would like to simply have everything in the folder forumroot/gallery/ to show up as In the Gallery.

Is this possible with this?

Depends.
AFAIK the existing Hooks only handle Filenames. So if the Filenames are unique it should work, otherwise I think it will not.